Electric switch.



PATENTED JULY 7, 1903,

v No. 732,745.

J. D. IHLDBR.

ELECTRIC 'sWITGHg APPLICATION FILED MAY5, 1902.

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J. D. IHLDER.

ELECTRIC SWITCH.

APPLICATION FILED MAY 5, 1902.

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No. 732,745. PATENTED JULY 7, 1903.

J. D. I'HLDER.

ELEGTRIG SWITCH.

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:mms versus co. PHo'raLITno., WASHINGTON o L UNITED STATES Patented :tub-7, 1903.

PATENT OFFICE.

JOHN D. IHLDER, OF YONKERS, NEW YORK, ASSIGNOR TO OTIS ELEVATOR COMPANY, OF `EAST ORANGEfNEW JERSEY, A CORPORATION OF NEW JERSEY.

ELECTRIC swiTcH.

SPECIFICATION forming part, of Letters Patent No. 732,745, dated July '7, 1903.

Application filed May 5, 1902. Serial No. 106,074. (No model.)

To blt whom t may'conccrro:

Be it known that I, JOHN D. IHLDER, a citi- Zen of the United States, residing at Yonkers,

in the county of Vestchester and State of 5 New York, have invented certain new and useful Improvements in Electric Switches,of which the following is a specification.

My invention relates to electric switches, more particularly to switches for changing the relations of electric circuits, as in cases where it is desired to re verse an electric motor.

lVlhile my invention may have various applications, it is designed for use as a reversing-switch and particularly applicable toV polyphase alternating-current circuits.

The objects of my invention are to improve upon switches of the class referred to and simplify and strengthen the parts,so that they may withstand constant usage without get ting out of order.

Further objects of my invention will hereinafter appear; and to these ends my invention consists in the electric switch designed to carry out the above objects, substantially as hereinafter shown and described in its construction and general mode of operation in the accompanying specification anddra'w'- ings, in which- Figure 1 is a perspective view ofthe switch. Fig. 2 is a side elevation, partly in section. Fig. 3 is a plan view with parts of the apparatus removed. in section, on line B B, Fig. 2; and Figs. 5 and 6 are diagrammatic views showing parts of the switch in different operative positions as applied to electric circuits.

Referring to the drawings, upon a suitable frame A are conveniently secured contacts 1 and a contact 2, while a plurality of pivoted contact-arms provided with contacts 4 are adapted to complete circuit with the contacts 1. Another separate and independent pivoted contact-arm 5, provided with a coutact, is adapted to complete circuit with contact 2j Suitable means are provided for actuating said contact-arms in the manner hereinafter 'to' bel described, and in this instancea movable member B is arranged in operative connection with the contact-arms 5o and rotatively supported upon a shaft C in Fig. 4 is an e1evation,partlyl I'bearings b on the frame. Suitable means are provided, as a segmental gear D on shaft C,for oscillating t-he member B,and,as shown, cams E F G are provided upon the member B, constructed to actuate the contact-arm.

The contact-arms 3 are of any desired shape and in this instance pivotally and independently supported upon shafts 7, arranged adjacent the member B and preferably at each side thereof, with the longer portions of the arms extending upward and the shorter p0rtions extending downward, the contacts being connected to the upper portions,while the lower portions are provided with followers in the form of rollers 8, pressed against the cams E and G by means of springs 9. `While there may be any suitable number of contactarms 3 in each set, but two are shown in each set in this instance in order to illustrate my invention in connection with a three-phase alternating-current circuit. (Illustrated diagranimatically in Figs. 5 and 6.) 4The separate and independent contact-arm 5 may be arranged in any suitable manner relative to the sets of arms; but in this instance it is shown as pivotally supported on one of the shafts 7 between the arms 3 on the same shaft,

with the longer portion extending downward,

carrying contact 6, while the shorter portion extends upward and is provided with a roller 10, pressed against the surface of the central cam F by means of a spring 1l. l

The springs 9 and 11 may be arranged in the frameAin any convenient manner; but, as shown, they are supported in recesses 12, the frame being broken away in Fig. 2 to show one of the recesses. A spring is thrust into a recess from the outside of the frame and held in place bya removable cap 13, provided with a lug 14, which may be turned to hold the cap in place, this construction of cap being old and well known.

The cams E, F, and G are so constructed and arranged that when the oscillating member B is in the central position (shownin Fig. 2) all of the followers Vbear upon highv parts of the cams and the circuit is broken at all of the contacts; but when the member B is moved to one side or the other either one of the sets of contact-arms 3 is actuated to close IDO the circuit,according'to the direction of movement of the cams, While the separate arm 5 is always actuated to close contact no matter to Which side the member B is moved. In order to accomplish this end, the cams E and G are formed circular with portions cut away at 15, while the central cam F, upon which followei` 10 bears, is configured, as indicated in dotted lines in Fig. 2, or, as shown in Figs. 5 and 6, with high parts at 16 and 17.

The operation of the switch will best be described with reference to Figs. 5 and G, in which the cams E, F, and G are diagrammatically shown separate, it being understood that they all operate together. In these figures the switch is shown as applied to the reversing of an alternate-current motor l-I, this being, of course, but one of its many applications, for with a suitable arrangement of circuits it may be applied to direct currents. The motor H is represented in this instance diagrammatically as a threephase asynchronous motor with a stator h, to the binding-posts 18 19 20 of which are led the circuits for the rotary field, while the circuits of the rotor are led from the slip-rings 2l. In reversing the field of the motor the connections to the posts 18 and 20 only are changed, while the connections ot' the third wire leading to the post 19 are never changed and are controlled by the contact-arm 5, which is always actuated in the operation of reversing the motor. The alternate-current mains for three-phase current are represented at 22, 23, and 24, and connection is made from the switches 25 26 27 to the contacts of the reversingswitch. In connecting up the switch thev contacts 1 (shown on the frame in the other figures) are connected to each other in pairs by wires 28, and the binding-posts 29 are connected, preferably, by flexible conductors 30 to the contacts 4 on the contactarms 3, while the binding-post 31 is connected by a flexible conductor 32 to the contact 6 of arm 5. Connections are then made, as shown, from the binding-posts 29 and 31 to the binding-posts 18, 19, and 20 on the motor. It will readily be seen that when contact-arms 3 on the right-hand side of the cams and the arm 5 are actuated to close circuit, as indicated in Fig. 5, then the circuits of the stator h will be completed to cause the motor to rotate in a given direction, while if the contactarms 3 on the left of the cams and also arm 5 are actuated, as shown in Fig. 6, the connections for the stator will be so changed as to reverse the eld of the motorand cause rotation in the opposite direction. When the oscillating member B is moved to the right from its position as shown in Fig. 2, the rollers 8 of arms 3 on the right of the cams will pass from the high part of cams E and G- to the portions 15 under the pressure of springs 9 and the rollers 10 of arm 5 will pass from the high to the low portion of cam F, so that the parts will take the positions indicated in Fig. 5. When the member B and cams are moved to the left from the position of Fig. 2, the parts will take the positions indicated in Fig. G and the connections f'or the motor will be reversed.

I do not herein claim anything disclosed and claimed in my copending application, Serial No. 106,071, filed May 5, 1902.

Without limiting myself to the precise construction shown and described, I claim- 1. An electric switch comprising aplurality of armsL another and separate arm, contacts on the arms and contacts cooperating therewith, and means for actuating any of said plurality of arms together with said other separate arm, substantially as described.

2. An electric switch comprising a frame, sets of arms, and a single arm, contacts on the arms, contacts on the frame cooperating therewith, cams for actuating the arms Whereby either of the sets of arms may be actuated together with the single arm, and means for operating the cams, substantially as described.

3. An electric switch comprising a frame, a plurality of contact-arms and a contact-arm independent thereof, contacts on the frame, and cams for actuating the arms whereby any of the plurality of contact-arms may be actuated together with said independent arm, substantially as described.

4. An electric switch comprising a frame, contacts thereon, an oscillating member provided with a plurality of cams, sets of contact-arms pivoted at each side of said member, contacts on said arms, followers connected to the arms and bearing upon the cams, a single arm also provided with a contact, and a follower bearing upon one of said cams, the cams being so constructed and arranged that according to the direction of movement of the oscillating member, either of the sets of arms may be actuated and the single arm will always be actuated, and means for actuating said oscillating member, substantially as described.

5. An electric switch comprising a frame and contacts thereon, an oscillating member supported on the frame and provided with a plurality of cams, at least two arms pivoted adjacent the cams, contacts onsaid arms, followers connected to the arms and bearing upon the cams, the cams being so constructed and arranged that according to the movement of the oscillating member either of the arms may be actuated to close circuit between its contact and a contact on the frame, and means for actuating said oscillating member, substantially as described.

An electric switch comprising a frame, an oscillating member, contacts on the frame at each side of said member and arms provided with contacts and pivoted at each side of said member and bearing thereon, and means for oscillating said member whereby according to the direction of its movement l'OO IIO

circuit is closed between a contact on an arm at one side and a contact on the frame, substantially as set forth.

7. An electric switch comprising a frame, contacts thereon, an oscillating cam, arms pivoted at each side of the cam and provided with contacts, rollers on the arms, means for normally pressing the rollers against the cam, and means for actuating the cam, whereby 1o circuitis closed between contacts on the frame and those on the arms at one side of the cam according to the movement of the cam,V substantially. described.

In testimony whereof I have signed my nameto this specification in the presence of 15 two subscribing witnesses.

JOHN D. IHLDER.

Witnesses:

F. W. NEWELL, C. B. MANVILLE. 

